Abstract
A field test of the effect of Hempa, Hexame-thylphosphoramide, C_6H_<18>N_3OP on the common housefly, Musca domestica vicina, by the milk-bait method was carried out at Sei Island in Seto Inland Sea from August to October in 1967. As the result of the test, comparatively good controlling effect of this chemosterilant on the appearance of housefly in autumn in the treated area was observed, though some problems seem to have remained in the technique of application.
